Apparatus for the removal of the reserve thread remainder from weft bobbins



Dec. 23, 1958 K. MOOS APPARATUS FOR THE REMOVAL OF THE RESERVE Filed NOV. 15, 1956 THREAD REMAINDER FROM ,WEFT BOBBINS 2 Sheets-Sheet 1 \N QM MN w W FQ N, W YE w WWW m I INVENTOR. [700.9

Dec. 23, 1958- K. MOOS 2,

APPARATUS FOR THE REMOVAL OF THE RESERVE THREAD REMAINDEZR FROM WEFT BOBBINS Filed NOV. 13, 1956 2 Sheets-Sheet 2 IN V EN TOR.

Kaspar H005 APPARATUS FOR THE REMOVAL OF THE segve TnREAD REMAINDER FROM WEFT B B i Kaspar Moos, Uster, Switzerland Application November 13, 1956, Serial No. 621,801

9 Claims. (Cl. 28-19) Dit'r erent machines have beeomeknown for theautobobbinsof automatic machines. Some of-these work with rigid or spring-loaded grippers or clips and are suitable only for bobbins with a cylindrical shank without a reserve groove, and in most cases cause damage to the shank surface. Other machines operate with a very strong blast of compressed air, which unwinds the thread end to a certain length, after which it is gripped by brush rollers, so that it can be unwound. Also, machines are known, in which the bobbin is introduced into a suction nozzle, and the thread remainder is removed by the suction air stream, after which the bobbin must be withdrawn. Most of these machines must be adjusted to the type of bobbin which is being used. When changing over from one'type of bobbin to another, prolonged change-over intervals are required.

The present invention relates to a method for the removal of the reserve thread remainder from weft bobbins for automatic machines, in:which. the..majority of the bobbin types can be cleaned without the machine having to be reset.

The method according to the invention consists offeeding the bobbins consecutively by an automatic conmoval device, where the free end of the thread is blown downward by the stream of compressed air into the neighbourhood of the thread removal device, after which the bobbins are conveyed through the thread removal device and the residual thread is removed, while the bobbins are being rotated about their axis. i

The invention also relates to a machine for carrying out this process. T 1 r g The drawing shows an example of an embodiment of the machine according to the invention, where: r

Fig. 1 is a diagrammatic side view of the machine,

Fig. 2 is a top view of the guide and of the conveying device of the machine,

Fig. 3 is a partial cross-section along the line 33 in Fig. 1, and Y Fig. 4 is a partial cross-section along the line 4-4 in Fig. 1.

The machine shown here has a long machine frame 1, which supports a guide 2 formed by parallel longitudinal rails 2a, 2b, and forming the boundary of a longitudinal slot 3. This guide is intended for the transportation of the weft bobbins 4 whose residual thread 35 is to be removed, and which areconveyed by a conveyor T band 5 towards an inclined magazine 6. At .the entrance to the inclined magazine 6 automatic scissors 7 are provided, which remove any long trailing threads 8 is a driving roller of the conveyor band 5, which is matic removal of the reservezthreadremainder oft-weft.

niv l bu h1ai v aeb t 1'9 byr h drive. 1 T

passage through the inclined magazine 6 and the ,entrance to,; the magazine areeach controlled by a bobbin detector-t 11 with a mercury switch 12, in such a way thatiif."

bobbins accumulate at these points, the mercury switch' 12 trips an electric-magnetic clutch 13 mounted in the. drive and thus stops the conveyor band 5. The transportation of the bobbins along the guide 2, 3 is ensured: by threeendlessconveyor belts 14a, 14b, 14c, made of" round rubber, which are guided over rollers l5. and are-- arranged in series. The bobbins 4 are guided in the;

guide slot 3 with their shank 4b downward, and are supported vvith theirtheads 4 q on the rai1s2a, 2 b forming, guide path. The conveyor belts frictionally contactthe bobbin head 4 a;. This frictional pressure is ensured in;Z thejcase of the conveyor belt 14b and Me by means of} intermediate guide rollers 16, which contactthe conlar. b on ...14 ,1 c, a ins the p p s guide part 212, and move forward in the guide'2, while atthe same time they are rolled in the direction required for :,unwinding the thread, In the first half of the conveyor stage, in the area of the conveyor belt 14b, a thread stripping disk 17 is provided, which rotates in the direction of the arrow shownin Eigs. 1 and 3. The thread stripping disk 17 is provided with a foam rubber coating 17 against which the bobbin 4 is pressed by a presfrom the bobbin dropping into the inclined magazinesj sure plate or retaining plate 18. 19 and 20, are two control -glev icesgarranged" with-some distance between them, and are pivoted on vertical pins 21 -of the guide part 2b, and r are connected so as to rotate together and are actuated jointly by means of an actuating rod23. The COHtIOI dBVlC QlS provided with a .notch 24 for lodging and conveying the bobbins 4. Control devices 19, 20'.

are each equipped with apawlZS, by means of which e b bb n a e. l cked. .q re ased dar n h rm a: towardsthe stripping device. Themotion of the bobbin hiqh s 'ea ed anei hb u p si th stripping; disk 17 is stopped by the control device 20 for an interval extending over several revolutions about itsown axis,

and during this tirne the following bobbin is also' re,-

tained by the control device 19. Du ring this period,

whilethe'bobbin are being retained y the control devices 19 and 20, the thread stripping disk 17 partially unwinds the residual thread of the bobbin The release; of the bobbins retained by the control devices 19 and 20 is effected at the same time. While the control device 19 swivels over to release the bobbin, the-following bob--= bins cannot move rinto the} notch .24. -This-prevents the simultaneous arrival of more than one bobbin to the thread stripping disk. The unwinding of the thread 35 by the threadstripper-17 is accelerated by a stream' of" compressed aim-admitted through a pipe 26, 'in a di rectionfrom aboveto below towards 'theshank of the bobbin in the thread stripper. 'In the neighbourhood "of the conveyor--belt 14c"a threadremoval device is provided underneath the bobbin guide 2, and formed by two--rollers 28 -and 29. The roller 29 is rotated and driven bya'belt drive 27 as shown in Fig. 4. The roller;

23 can-'rotate-with its axial pin 31in slot-shaped bearings 30, and is pushed against the other roller by springs 32 supported against theaxial pin of the other roller. The

stripping rollers 28 and 29 are tapered at their ends facing the arriving bobbin, where one of. the rollers is also provided with a thread ,catching .slot At the entrance to the thread removal device a tube 33 for cornpressed air is provided, through which a stream of'corn pressed airis guided frc rn; above to belowbetweenuthe bobbin and air deflector sheets, adjoining the guide path 2a and 2b, where the stream of air is intended to stretch in a vertical direction the part of the thread 35 which has beenunwonnd from thebobbin soas' to facilitate;

the entrance of the thread 35 between the rollers 28 and Patented D c- ;23, .22. &;

29 respectively. A brake sheet 36 is fixed to one of the deflector sheets 34, and prevents the oscillating motion of the bobbins in the neighbourhood of the air stream. The elastic pressure of the brake sheet can be adjusted by means of an adjusting screw 37. Opposite the conveyor belt 14c a supporting bar 38 equipped with a foam rubber coating is arranged, and by means of which the position of the bobbins during their motion over the thread removal device is stabilized. In order to prevent the winding of residual threads over the thread removal rollers 28 and 29 respectively, thread strippers 39 and 40 are provided, which make contact with the rollers. The bobbins cleaned of their residual threads drop upon a deflector plate 41 and into a container placed in a suitable position but not shown in the drawing.

By means of this machine all types of bobbins for automatic machines can be cleaned, such as bobbins with a slightly tapered shank, with or without reserve grooves, and bobbins with a strongly tapered initial portion of the shank, with shallow or deep reserve grooves, and also the new Riiti-high-speed loom bobbins. When using bobbins whose head diameters vary considerably, there is a possibility of setting one of the guide bars, 2b, of the bobbin guide, which is fixed by means of screws passing through adjustment slots, so as to suit the bobbin.

While the invention has been described in detail with respect to a now preferred example and embodiment of the invention it will be understood that various changes and modifications may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. A machine for the removal of the reserve thread remainder of weft bobbins for automatic machines, comprising in combination a slot-shaped guide, supporting the bobbins to be conveyed by their heads, with their shanks pointing downward, and at least one endless conveying device making frictional contact with the bobbins at their heads, and conveying them while they are being rotated at the same time in the direction of unwinding the thread, a thread stripping device, with a soft adhering body, moving with a rotational motion from above to below over the bobbin shank, and means for the intermittent stoppage of the conveying motion, limiting it to a rotation of the bobbin about its own axis in the direction of unwinding, and a thread removal device and immediately in front of it a pipe for compressed air whose stream of compressed air forces the end of the I thread to unwind from the bobbin and enter into the neighbourhod of said thread removal device.

2. A machine for the removal of the reserve thread remainder of weft bobbins for automatic machines comprising in combination a slot-shaped guide, supporting the bobbins to be conveyed by their heads, with their shanks pointing downward, and at least one endless conveying device making frictional contact with the bobbins at their heads, and conveying them while they are being rotated at the same time in the direction of unwinding the thread, a thread stripping device, with a soft adhering body, moving with a rotational motion from above to below over the bobbin shank, and means for the intermittent stoppage of the conveying motion, limiting it to a rotation of the bobbin about its own axis in the direction of unwinding, and a thread removal device and immediately in front of it a pipe for compressed air whose stream of compressed air forces the end of the thread to unwind from the bobbin and enter into the neighbourhood of said thread removal device, said conveying device consisting of an endless adhering driving belt guided over two rollers and intermediate guide rollers making contact with said driving belt.

3. A machine for the removal of the reserve thread remainder of weft bobbins for automatic machines, comprising in combination a slot-shaped guide, support-ing 4 the bobbins to be conveyed by their heads, with their shanks pointing downward, and at least one endless conveying device making frictional contact with the bobbins at their heads, and conveying them while they are being rotated at the same time in the direction of unwinding the thread, a thread stripping device, with a soft adhering body, moving with a rotational motion from above to below over the bobbin shank, and means for the intermittent stoppage of the conveying motion, limiting it to a rotation of the bobbin about its own axis in the direction of unwinding, and a thread removal device and immediately in front of it a pipe for compressed air whose stream of compressed air forces the end of the thread to unwind from the bobbin and enter into the neighbourhood of said thread removal device, said conveying device being formed by several consecutive endless driving belts, made of rubber, each guided over two rollers and following each other in stages.

4. A machine for the removal of the reserve thread remainder of weft bobbins for automatic machines, comprising in combination a slot-shaped guide, supporting the bobbins to be conveyed by their heads, with their shanks pointing downward, and at least one endless conveying device making frictional contact with the bobbins at their heads, and conveying them while they are being rotated at the same time in the direction of unwinding the thread, a thread stripping device, with a soft adhering body, moving with a rotational motion from above to below over the bobbin shank, and means for the intermittent stoppage of the conveying motion, limiting it to a rotation of the bobbin about its own axis in the direction of unwinding, and a thread removal device and immediately in front of it a pipe for compressed air are provided whose stream of compressed air forces the end of the thread to unwind from the bobbin and enter into the neighbourhood of said thread removal device, said stri ping device consisting of a rotating disk provided with a coating of foam rubber and a retainer forced by elastic means against the bobbin shank, and a pipe for the supply of compressed air pointing from above to below towards the shank of the bobbin which is being processed by said stripper.

5. A machine for the removal of the reserve thread remainder of weft bobbins for automatic machines, comprising in combination a slot-shaped guide, supporting the bobbins to be conveyed by their heads, with their shanks pointing downward, and at least one endless conveying device making frictional contact with the bobbins at their heads, and conveying them while they are being rotated at the same time in the direction of unwinding the thread, a thread stripping device, with a soft adhering body, moving with a rotational motion from above to below over the bobbin shank, and means for the intermittent stoppage of the conveying motion, limiting it to a rotation of the bobbin about its own axis in the direction of unwinding, and a thread removal device and immediately in front of it a pipe for compressed air whose stream of compressed air forces the end of the thread to unwind from the bobbin and enter into the neighbourhood of said thread removal device, two control devices connected so as to move together, and being arranged on a rail of said slot-shaped guide opposite said conveying device in front of said stripping device, where one of the control devices releases the path for an arriving bobbin as soon as the other device releases the path after the preceding bobbin had been stopped for a certain period required for stripping the thread. Y

6. A machine for the removal of the reserve thread remainder of weft bobbins for automatic machines, comprising in combination a slot-shaped guide, supporting the bobbins to be conveyed by their heads, with their shanks pointing downward, and at least one endless conveying device making frictional contact with the bobbins at their heads, and conveying them while they are being rotated at the same time in the direction of unwinding the thread,

a thread stripping device, with a soft adhering body, moving with a rotational motion from above to below over the bobbin shank, and means for the intermittent stoppage of the conveying motion, limiting it to a rotation of the bobbin about its own axis in the direction of unwinding, and a thread removal device and immediately in front of it a pipe for compressed air whose stream of compressed air forces the end of the thread to unwind from the bobbin and enter into the neighbourhood of said thread removal device, said removal device consisting of two rollers, arranged so as to be parallel below the bobbin guide and of which one is driven, and the other is forced by spring pressure against the driven roller, the ends of both rollers facing the arriving bobbins being tapered, and one of the rollers being provided with a threadcatching slot.

7. A machine for the removal of the reserve thread remainder of weft bobbins for automatic machines, comprising in combination a slot-shaped guide, supporting the bobbins to be conveyed by their heads, with their shanks pointing downward, and at least one endless conveying device making frictional contact with the bobbins at their heads, and conveying them while they are being rotated at the same time in the direction of unwinding the thread, a thread stripping device, with a soft adhering body, moving with a rotational motion from above to below over the bobbin shank, and means for the intermittent stoppage of the conveying motion, limiting it to a rotation of the bobbin about its own axis in the direction of unwinding, and a thread removal device and immediately in front of it a pipe for compressed air whose stream of compressed air forces the end of the thread to unwind from the bobbin and enter into the neighbourhood of said thread removal device, a supporting bar with a foam rubber coating arranged above said thread removal device, and opposite said conveyor belt against which the head of the bobbin passing said thread removal device is pushed by said conveyor belt.

8. A machine for the removal of the reserve thread remainder of weft bobbins for automatic machines, comprising in combination a slot-shaped guide, supporting the bobbins to be conveyed by their heads, with their shanks pointing downward, and at least one endless conveying device making frictional contact with the bobbins at their heads, and conveying them while they are being rotated at the same time in the direction of unwinding the thread, a thread stripping device, with a soft adhering body, moving with a rotational motion from above to below over the bobbin shank, and means for the intermittent stoppage of the conveying motion, limiting it to a rotation of the bobbin about its own axi in the direc tion of unwinding, and a thread removal device and immediately in front of it a pipe for compressed air whose stream of compressed air forces the end of the thread to unwind from the bobbin and enter into the neighbourhood of said thread removal device, and two bobbin and air deflector plates arranged on said slotshaped guide, in the direction of said slot-shaped guide and With some distance between them.

9. A machine for the removal of the reserve thread remainder of weft bobbins for automatic machines, comprising in combination a slot-shaped guide, supporting the bobbins to be conveyed by their heads, with their shanks pointing downward, and at least one endless conveying device making frictional contact with the bobbins at their heads, and conveying them while they are being rotated at the same time in the direction of unwinding the thread, a thread stripping device, with a soft adhering body, moving with a rotational motion from above to below over the bobbin shank, and means for the intermittent stoppage of the conveying motion, limiting it to a rotation of the bobbin about its own axis in the direction of unwinding, and a thread removal device and immediately in front of it a pipe for compressed air whose stream of compressed air forces the end of the thread to unwind from the bobbin and enter into the neighbourhood of said thread removal device, and two bobbin and air deflector plates arranged on said slotshaped guide, in the direction of said slot-shaped guide and with some distance between them, between said bobbin and air deflector plates at the entrance to said thread removal device a brake sheet provided with an adjusting screw and fixed to one of said air deflector plates, to prevent an oscillating motion of the bobbin.

References Cited in the file of this patent UNITED STATES PATENTS 2,070,193 Alderman Feb. 9, 1937 2,132,344 Kleeb, Ir. Oct. 4, 1938 2,267,679 Terrell et a1 Dec. 23, 1941 2,342,909 Terrell Feb. 29, 1944- 

